windows.h pulls in rpcndr.h, which defines `small` as `char`. The R64 BC1
array case added in b7b335ac declared `const auto small`, so the Windows
build of shader_recompiler_compute_tests failed to compile:
ShaderRecompilerComputeTests.cpp(17928,24): error: expected unqualified-id
Rename the local to `small_array`.
tests: avoid empty optional::emplace() on IndirectDescriptor (fixes Linux build)
clang with libstdc++ 14 does not treat std::optional<DescriptorSource::IndirectDescriptor>
as default-constructible (nested struct with default member initializers), so the
argument-less emplace() fails to resolve. Pass an explicit value-initialized
IndirectDescriptor, matching the form already used elsewhere in this file.
HamsterCL